Wrench



June 16, 1925. I

M l "A M w m We 4 mm 7 Eu w w fi H G J CHAMBERLAIN wasucu Filed Feb 5, 1924 LE E Event 2 .J. [ham June 16, 1925.

G. J. CHAMBERLAIN WRENCH Filed Feb. 5. 1924 I m Wing" Hm I gwumv' J. Eh am'b'er Patented June 16, 1925.

UNITED STATES .GEORGE J. CHAMBERLAIN, F MILWAUKEE, WISCONSIN.

PATENTOFFICE.

wnm cn.

Application filed February 5,1924. Serial No. 690,82b.

To all whom it may concern:

Be it known that. I, GEORG J. CHAMBER- LAIN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in a Wrench, of which the following is a specification.

This invention relates to improvements in lo wrenches. p

The primary object of this invention is the provision of an adjustable wrench which is particularly well adapted for use on bridge or dock construction operations, or

for use by line men where overhead work is required; the wrench being easily adjuste A further object of this invention is the provision of a wrench which embodies a handle construction upon which adjustable jaws are mounted for relative adjustment and for rotation with respect to the handle so that the wrench may be used where it is undesirable to reset the wrench after each nut tightening or loosening operation; the handlebeing so related to the wrench parts that it may be oscillatively used to move the jaws in continuous manner for nut tightening or loosening, as the case may be.

Other objects and advantages'of this invention will be apparent during the course of the following detailed description.

In the accompanying drawings, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several views, I r

Figure 1 is a front elevation of theims proved wrench, showing a certain portion of the handle broken away to expose a spring urged pawl and itsrelation to ajaw carrying disc.

Fig. 2 is aside elevation of the improved wrench.

Fig. 3 is a rear elevation of the improved wrench, showing parts thereofbroken away to expose details.

Fig. 4 is a longitudinal cross sectional view taken through the improved wrench.

Fig. 5 is a transverse cross sectional View taken through the head of the improved Wrench, showing thejaw construction thereof, substantially on the line 5-5 of Figure 1. I Figs 6, 7 and 8 are cross sectional views which the V pawl E iscarried by the handle construction B for cooperation with the head or disc taken substantially on their respective lines .in Figure 1 of the drawings.

In the drawings, wherein for the purpose of illustration is shown but the'preferred embodiment of the improved wrench the letter A may generally designatethe wrench which may include a handle construction B; rotatable head or disc construction C carried by the handle construction B, and upon jaw construction Dis mounted.

C to maintain the same in a desired relation with respect to the handle. Referring to the handle construction B, the same is substantially cylindrical in for mation and is formed of the semi-cylindrical sections 15 and 16, which are long1tudinally grooved inwardly of their facing sides to provide a passageway 17 within which the pawl shank 18 is reciprocably mounted, as

will be subsequently described. The section 16 at its outer end is preferably provided with an extension arm or portion 18 which has an opening 19 transversely therethrough. The sections 15 and 16 are detachably clamped together to provide the cylindrical formed handle, by means of counter-sunk screws 20 which are tangentially inserted through the sections 15 and 16, substantially as is illustrated in Figures 1 and 8 of the drawings. The heads of these screws 20 are countersunk in the section 15, in openings 21 provided inwardly of the outer circumference of the handle, so that the operator imay grasp the handle without impedance by the clamplng or connecting screws 20.

Referring to the member C, the same preferably includes a body portion 25, which is disc shaped, and which is provided with a central extension 26 axially. extending at right angles from the body or disc 25, and which is preferably provided with external screw threads to detachably receive a nut or ring shaped clampin member 27 thereon. Thls extension 26 ad acent the disc shaped body 25 is externally smooth to provide a bearing surface for receiving the head or extension 18 thereover; the extension 26 bein inserted throughthe opening19 of the handle extension 18. The nut or ring member 27 of course, engages over the screw threaded end of the tubular extension 26 of the member C and clamps the disc shaped member C for rotation or pivotal movement upon the end of the handle construction B, as can readily be" understood. The member C is preferably provided with a central opening 28 and various other transverse openings 29 through (tl're disc body thereof, as a means to lighten the wrench, with out sacrificing any reinforcing quality there'- of at the essential points. The marginal or circumferential portion of the disc body 25 is provided with spaced teeth 30 with recesses 31 therebetween within which the pawl head 32 engages to hold thewrench 'dijsc er member C in a desired adjustment respect to the handle construction B, and as will be subsequently mentioned.

Referring to the j aw construction 1), the same preferably includes similarly formed jaws and 36' which are slidably carried by i'ev'oluble i'neinber C on opposite sides of the axis of rotation tliere'of, and for radial adjustment upon the disc portion 25 of the mb'e'r C. Each of these jaw constructions preferably include a 'jaw plate 38 which is polygonal information, and which has fixedly & t cli'ed thereto a guide lug extension 39 disposed at right angles thereto, and slidably mut d in aradial groove 40 formed inwardly of th'e'face of the disc body 25. Th'ejaw plate 38, of course, is disposed adjacent the axis of the disc C, and the guide rib orenemies lug 39 eitends toward the margin or circumference of the same. Just up wa'rdly of the rib 39, and preferably parallel thereto,- a screw threaded shank is fixedly carried by each jaw plate 38, and extends through aligning openings provided in the upstanding wall portions 46 of a substantially U-shaped member 47, A U-shaped member 47 is, of course, provided for each jaw 35 and 36, and between the walls or upstanding portions 46 thereof 'rotatably receives, a thumb nut provided with a screw threaded opening lherethrough which adjust abl receives the screw threaded shank 45 therein. As the frame 47 is fixed with respect to the disc body 25, and as the nut 49 is prevented from movement out of the space between the walls 46, it is obvious that upon rotation of the nut 49 the jaw plate 38 will either be fed toward or away from the frame 47, depending upon the direction of rotation of the thumb nut 49. The frame 47 is provided Witha groove 50 therebelow, contiguous with the groove 40 and receives the guide lugv 39 of the aw therethrough.

From the foregoing description of the jaw construction it is apparent that upon adjustment of the nut 49 the jaw plates 38 maybe moved toward or away from each other. The jaw plates 38, of course, face each other and are adapted to receive in the space therebetween a nut or other object to be engaged to perform an adjusting operation, as can be readily be understood,

Referring to the pawl construction by means of which the handle and jaw supporting disc may be relatively controlled during a nut or bolt-adjusting operation, the pawl shank 18, as before mentioned is slidably disposed inthe longitudinally extending passageway 17 of the handle B. This shank 18 of the pawl member at its rear end is enlarged as at 60, and at its forward end supports the enlarged pawl head 32. A compression spring 61 is carried in the handle B, at one end engaging the pawl head 32 on an annular shoulder (33 at the juncture of thehe'a d 3:2 with the shank 18; said spring at itsother end resting upon an annular shoulder (34 in the handle and being under compression to urge the pawl into engagei'nent with the toothed circu'n'iference of the discbody 25, substantiallv as is illustrated in the drawings. The pawl shank 18 extends clear through the handle l5 and at the hand grasping end of'the handle extends outwardly of'the end of said handle and is provided with a linger engaging head (in. Adjacent the finger engaging head (35 um pawl shank portion '60 has apin (3'? extending diametrically tliei-etlii-ongli so that at its ends it extends laterally of the cireuni'lei'ence of said pawl shank; suitable recesses v(39' being formed in diametrically aligning relation inwardly of the end s'n|- face of the handle sections 15 and 16, to receive the outward em-tensions of the pin 6? tl'i'erein, whereby to locate the pawl 'in a definite relation to the movable head C.

, Re ing to the manner of operation of tl1'e"viii'1pi' o\ec l' wrench, the jaws 35 and 36 are adjusted by means of the nuts 49 that the jaw plates 38 thereof are spaced to receive therebetween the object, such as a nut or bolt, to' be adjusted. The adjusting of this bolt of nut may cliected" without disconnection of the wrench therefrom until the adjusting o' ieration has been entirely finished. This is pfern'iitted because the pawl head 32 i' 'in-ged by the spring (51 ll l'tl) engagement with the teeth 30 of the disc construction C, and theteeth 3O engage the fiat side 69 of the pawl head 32 to prevent rotation of the disc C in one direction about its axis. However, the opposite side of the disc 32' is provided with a' tapered surface 70 over which the teeth 30 of the head C may slide, so that the handle B may bcoscillated back and forth during the nut or bolt adjusting operation; If it is desired to tighten a bolt or a nut the pawl construction is so adjusted that the tapered surface 70 faces in one direction, whereas if it is desired to use the wrench for bolt or nut loosening the pawl shank is drawn rearwardly means of the finger member and rotated an extent of 180 until the tapered surface faces the teeth in opposite direction to that above mentioned and then released so that the pin 67 will again enterthe tion. As the handle is moved for replace-' ment with respect to the disc construction C, the pawl 32 is moved rearwardly, against compression of the spring 61, and the tapered surface 70 slides over the teeth 30, as can readily be understood.

From the foregoing description of this invention it is apparent that a wrench has been provided which has a relatively simple type of jaw construction, and which may be easily handled to perform heavy'work.

The pawl construction is compactly and effectively located where it may be most readily controlled, and the wrench is automatic in so far as replacement of the handle construction is concerned during the tightening or loosening operation which is being effected. i I

Various changes in the shape, size, and

arrangement of parts may be made to the' form of the invention herein shown and described, without departing from the spirit of this invention or the scope of the claims I claim: 1.111 a wrench construction the combination of a supporting member, jaws slidably carried by said supporting member in a fixed path of travel, screw threaded shanks carried by said jaws, frames carried by said supporting member providing spaced walls, having apertures therethrough for receiving the screw threaded shanks of the jaws there through, and nuts carried in the frames between the walls thereof having screw threaded bores therein for adjustably receiving the screw threaded shanks of said jaws whereby upon rotation of said nuts the jaws will be independently adjusted with respect to each other.

2. In a Wrench the combination of a supporting member having oppositely extending grooves therein, jaw plates, guide lugs carried by said jaw plates slidable in said grooves, frames fixed with respect to said supporting member and extending in straddling relation to said grooves and guide lugs and provided with spaced walls having apertures therein, screw threaded shanks carried by said jaw plates extending in the same direction as said guide lugs and disposed through the openings of the walls of said frames, nuts adjustable on the screw threaded shanks in the frame between the walls thereof, and handle'means adjustably supporting said supporting member thereon.

GEORGE J. CHAMBERLAIN. 

